2013年12月29日星期日

The role of aluminum and gallium in titanium bar and titanium alloys in

Aluminum and gallium are titanium with a titanium and β form substitutional solid solution, mainly from the solid solution strengthening effect . The standard rule of titanium , industrial pure titanium in addition , almost all contain a certain amount of aluminum.

A2 relative to control due to the occurrence embrittlement , aluminum and other elements considered with the precipitation of a2 , the concept of aluminum equivalent . In a titanium alloy ,tittanium bar the aluminum equivalent of the following relationship :

AL `= AL +1 / 3Sn +1 / 6Zr +10 O` ≤ 8

Wherein , AL ` aluminum equivalent , AL, Sn, Zr weight percentage of these elements are in the alloy . O ` elements affecting the gap , also called oxygen equivalent . Oxygen equivalent to :

O `= O + C +2 N

Where O, C and N are both of these elements in the weight percentage of titanium . When adding titanium silicon , aluminum equivalent should be:

AL `= AL +1 / 3Sn +1 / 6Zr +4 Si ≤ 8

In the practical application of these formulas have some effect.

In the heat treatable alloys β , in order to prevent the produce ω phase metastable β phase decomposition when caused by brittle , you need a certain amount of aluminum , usually around 3%.

Adding aluminum in titanium alloys can be formed by the middle of alloys with high melting point metal to prevent intolerable metallic inclusions , the ingot ingredients evenly.titanium pipe If 78% Mo Mo - aluminum master alloy melting point of molybdenum can be reduced to about 1900 ℃.

There are currently being developed to Ti3AL and TiAL new high-temperature titanium alloy as the base , but the actual industrial production from a certain distance .

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